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. 1990 Mar;58(3):598–602. doi: 10.1128/iai.58.3.598-602.1990

Transmembrane diffusion channels in Mycoplasma gallisepticum induced by tetanolysin.

S Rottem 1, K Groover 1, W H Habig 1, M F Barile 1, M C Hardegree 1
PMCID: PMC258507  PMID: 2307513

Abstract

The permeability properties of Mycoplasma gallisepticum cells treated with a purified preparation of tetanolysin were investigated by determining the initial swelling rates of cells suspended in an isoosmotic solution of electrolytes or nonelectrolytes. The swelling, initiated by the tetanolysin, depended on the tetanolysin concentration and was markedly affected by the molecular size of the various osmotic stabilizers utilized. Thus, the initial swelling rates in an isoosmotic solution of monosaccharides were much higher than those in isoosmotic solutions of di-, tri-, or tetrasaccharides. Cell swelling induced by tetanolysin was much lower with energy-depleted M. gallisepticum cells, with arsenate-treated cells, or when the membrane potential (delta psi) was collapsed by valinomycin (10 microM) plus KCl (100 mM). Swelling was not affected by the proton-conducting ionophore carbonyl cyanide-m-chlorophenylhydrazone (1 to 10 microM) or by nigericin (5 microM). These results support the concept that the damage induced by tetanolysin is due to the formation of water-filled pores within the membranes of energized M. gallisepticum cells. Such pores allow the diffusion of hydrophilic molecules into the cells and may vary in size, depending on the tetanolysin concentration utilized.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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